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Method for removing pollutants by synergistically catalyzing persulfate with molybdenum disulfide and ferric ions

A persulfate and molybdenum disulfide technology, which is applied in the field of water pollution treatment, can solve the problems of easy precipitation, difficult circulation, and reduce the use of persulfate and ferric iron, so as to achieve low usage, low consumption, and iron reduction. The effect of sludge

Inactive Publication Date: 2020-04-14
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the invention solves the problems that Fe(III) is easy to precipitate and Fe(III) / Fe(II) is difficult to circulate in the Fe(III) excited persulfate system, and the molybdenum disulfide has the advantages of being recyclable, environmentally friendly and non-toxic. Secondary pollution and other advantages, this method reduces the use of persulfate and ferric iron under the premise of ensuring removal efficiency, and has strong practical application value

Method used

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  • Method for removing pollutants by synergistically catalyzing persulfate with molybdenum disulfide and ferric ions
  • Method for removing pollutants by synergistically catalyzing persulfate with molybdenum disulfide and ferric ions
  • Method for removing pollutants by synergistically catalyzing persulfate with molybdenum disulfide and ferric ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this embodiment, at first molybdenum disulfide and Fe(III) ions synergistically catalyze and activate persulfate to degrade the degradation effect of each micro-pollutant in water, specifically:

[0038] Add 0.03g of molybdenum disulfide to a conical flask filled with 88ml of ultrapure water, mix with room temperature ultrasonic (power 300W) for 1min, add 10mL, 100mg / L rhodamine B aqueous solution, 1mM 10mM ferric chloride aqueous solution 1mL, and use 0.1 M sulfuric acid aqueous solution to adjust pH=3.0, stir evenly, then add 1mL of 150mM PMS aqueous solution to form a reaction system of 100ml, stir and react at room temperature, take 1ml of water sample before adding PMS as "zero point" (absorbance value is recorded as A0) With the water sample after reacting for 60min (the absorbance value is recorded as A1), the absorbance value is measured at 558nm by ultraviolet spectrophotometry, and the removal rate is calculated according to A1 / A0.

[0039] Under the same c...

Embodiment 2

[0044] In this example, under different pH conditions, molybdenum disulfide and Fe(III) ions synergistically catalyze and activate persulfate to degrade the degradation effects of various micropollutants in water, specifically:

[0045] Add 0.03g of molybdenum disulfide to a conical flask filled with 88ml of ultrapure water, mix with room temperature ultrasonic (power 300W) for 1min, add 10mL, 100mg / L rhodamine B aqueous solution, 1mM 10mM ferric chloride aqueous solution 1mL, and use 0.1 M sulfuric acid aqueous solution or 0.1M potassium hydroxide aqueous solution to adjust pH=3.0~9.0 (3.0, 5.0, 7.0, 9.0), stir evenly, then add 1mL of 150mM PMS aqueous solution to form 100ml of reaction system, stir and react at room temperature, take 1ml of The water sample before adding PMS is "zero point" and the water sample after 60min, and its removal rate is calculated with the method of Example 1.

[0046] Under the same conditions, the rhodamine B aqueous solution was replaced with 5...

Embodiment 3

[0048] This example investigates the degradation effect of free radicals generated by catalytic activation of different control tests based on persulfate, molybdenum disulfide, and ferric iron to degrade pollutants in water.

[0049] Weigh Rhodamine B and dissolve it in water to prepare a rhodamine B aqueous solution with a concentration of 100mg / L for subsequent use; measure PMS and dissolve it in water to prepare a 150mM PMS aqueous solution for subsequent use; weigh ferric chloride hexahydrate solid and dissolve it in water Prepare a ferric chloride aqueous solution with a concentration of 10mM for later use.

[0050] The specific operation steps are as follows:

[0051] (1) Add 0.03g of molybdenum disulfide to a conical flask containing 90mL of ultrapure water, mix with room temperature ultrasonic (power 300W) for 1min, add 10mL of 100mg / L rhodamine B aqueous solution, and adjust the pH with 0.1M sulfuric acid aqueous solution= 3.0, stir evenly, carry out the degradation ...

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Abstract

The invention discloses a method for removing micro-pollutants by synergistically catalyzing persulfate with molybdenum disulfide and ferric ions. The method comprises the following steps: adding molybdenum disulfide into ultrapure water, carrying out ultrasonic uniform mixing at room temperature, adding organic dye wastewater, uniformly mixing, adding ferric iron, adjusting the pH value to 3-9, adding persulfate to form a reaction system, and carrying out stirring at room temperature to degrade pollutants in organic dye wastewater. According to the invention, molybdenum disulfide and ferric ions are used for efficiently catalyzing and decomposing persulfate to generate sulfate free radicals and hydroxyl free radicals so as to further achieve oxidative degradation of micro-pollutants in water, wherein the degradation effect of a PMS / Fe<3+> / MoS2 system reaches more than 95%, the application pH range is wide, the molybdenum disulfide consumption is low, the molybdenum disulfide can be repeatedly utilized, and secondary pollution is avoided; and the method has the advantages of simple process flow, no need of complex devices, mild reaction conditions, rapid reaction at normal temperature and normal pressure, strong operability and wide practical application prospect.

Description

[0001] (1) Technical field [0002] The invention belongs to the technical field of water pollution treatment, and in particular relates to a method for quickly removing pollutants by synergistically catalyzing and activating persulfate with molybdenum disulfide and ferric ions. [0003] (2) Background technology [0004] In recent years, advanced oxidation processes (AOPs) have attracted more and more attention due to their advantages of high efficiency and environmental protection. Chemical oxidants convert organic pollutants into harmless or less harmful chemicals when they enter the pollution source directly. The oxidizing agents used include hydrogen peroxide (H 2 o 2 ), persulfate (S 2 o 8 2- ), permanganate (MnO 4- ), ozone (O 3 ) and Fenton’s method (·OH). [0005] In advanced oxidation processes (AOPs), persulfate is a strong oxidant that can be activated by heat, alkali, exchange metals, and electricity to generate sulfate radicals (SO 4 - ·). Due to the su...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F101/30
CPCC02F1/722C02F1/725C02F2101/308C02F2305/02C02F2305/023
Inventor 罗宏伟程莹曾一峰何东芹潘响亮
Owner ZHEJIANG UNIV OF TECH
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